My 2 chihuahua puppies wont stop crying...any help?

Ok so my 2 month old chihuahuas wont stop crying! I can't even sleep at night. They are crying right as we speak. They are both male. Any tips on how to make them stop? Well one cries the most, and the other cries for a while then stops, but the other one continues. Also I go back to school tomorrow.
Update: I dont think they are sick. Cuz when I pick up the one that is crying the most he stops.
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